JPH04209193A - Magnet brake safety device of man conveyor - Google Patents

Abstract

PURPOSE:To sense failure in a magnet brake at early stage independently from the ambient temp. by sensing magnet brake and its ambient temp., calculating the brake temp, by a calculating device while the environmental influence is excluded, comparing the result from calculation with the max. temp. rising rate of a man conveyor, and stopping if judged as failure. CONSTITUTION:A temp. sensing device 5a installed on an outer disc 5 senses always the temp, variation of the outer disc 5, while the temp. of the periphery of a magnet brake at the same time is sensed by another temp. sensing device 1a. From the temp. data given by these sensing devices, a calculating device 8 calculates the temp. variation of the outer disc 5 which has got rid of influence of the temp. variation of the magnet brake periphery in the machine room, and the data obtained from calculation is fed to a comparator device 9. This 9 makes sampling at all times and compares the temp. rising rate within the same period of time with the max. temp. rising rate at which a man conveyor concerned can operate normally by the same sampling method using the temp, data obtained from the previous calculation. The machinery is stopped when the temp. rising rate of the outer disc part exceeds the wax. temp. rising rate.

Description

[Detailed description of the invention]

[00011

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a passenger conveyor, and more particularly to a safety device for a magnetic brake that can detect malfunction of a magnetic brake at an early stage. [0002] [0002] When power is supplied to the drive motor and electromagnetic brake of a passenger conveyor, if the brake is not completely released due to a break in the brake coil of the electromagnetic brake or some other cause, a portion of the brake shoe may be damaged. As a result, a portion of the brake shoe may generate excessive heat and smoke, or the motor may burn out. In a situation where a portion of the brake shoe is burnt out, even if the stop switch is pressed to bring the passenger conveyor to an emergency stop for some reason, the passenger conveyor will not stop, which is extremely dangerous for passengers. As a conventional electromagnetic brake abnormality detection device, as described in Utility Model Application Publication No. 61-160174, a temperature sensor is provided on the brake shoe, and when an abnormal temperature is detected, the power to the motor is cut off. A drive device has been proposed. [0003]

[Problems to be Solved by the Invention] The configuration of the conventional safety device as described above does not take into account differences in the location or region where the passenger conveyor is installed. Therefore, even when detecting the temperature around the brake shoes, the temperature in the passenger conveyor machine room varies depending on the air conditioning situation in the building, the outside temperature, the weather, the installation location of the passenger conveyor, etc., so the situation at the time of detection is the initial one. If the conditions are significantly different from the set conditions, a situation may occur in which the detection time limit is extended. As described above, temperature changes in the machine room may adversely affect the temperature detection device attached around the brake shoes of the magnetic brake, and the safety device may malfunction if it is not activated. An object of the present invention is to solve the above-mentioned problems and provide a safety device for a magnetic brake of a passenger conveyor that can detect an abnormality of the magnetic brake at an early stage regardless of the temperature inside the machine room of the passenger conveyor. There is a particular thing. [0004]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a magnetic brake safety device for a passenger conveyor in which steps are connected in an endless manner and is provided on a rotating passenger conveyor. A first temperature detection device detects the temperature, a second temperature detection device detects the ambient temperature of the magnetic brake housed in the passenger conveyor machine room, and the ambient temperature is determined based on the temperature data respectively transmitted from both temperature detection devices. A calculation device that calculates the temperature of the brake shoe itself excluding the influence of temperature, and a calculation device that receives the data after calculation processing from this calculation device and calculates the temperature rise rate within a preset standard time and the maximum temperature at which the passenger conveyor can operate normally. A comparison device that compares the temperature rise rate and data from this comparison device determine whether the passenger conveyor is operating normally. If it is determined that there is an abnormality, a command to stop the passenger conveyor is output. The configuration includes a control means. [0005]

[Operation] As described above, in the present invention, the first temperature detection device detects the temperature of the brake shoe of the magnetic brake,
The second temperature detection device detects the temperature around the magnetic brake in the machine room. Both temperature sensing devices communicate measurement data to a computing device. From the received temperature data, the calculation device calculates the temperature of the machine room and the temperature change of the brake shoe of the magnetic brake that rises and falls separately from both data, and transmits the calculated data to the comparison device. The comparison device divides the received two data into a preset time, calculates the temperature increase rate within this time, and compares it with the maximum temperature increase rate, which is the limit value when the passenger conveyor is operating normally. Make a comparison. The comparison result is transmitted to the passenger conveyor control device, and when the temperature increase rate is determined to be abnormal based on the comparison result, a command signal is outputted to take measures to stop the passenger conveyor. Thereby, an abnormality in the magnetic brake can be detected at an early stage. [0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the magnetic brake for a passenger conveyor according to the present invention will be described below with reference to the drawings. [00071] FIG. 1 is a longitudinal sectional side view showing a disc-type magnetic brake, which is attached to the high-speed shaft 7 of the speed reducer 1. The disc 4 has a lining 4a and is inserted into the spline hub 6, and the armature 3 is brought into contact with the rotating disc 4, and the friction force generated by sandwiching the disc 4 between the armature 3 and the outer disc 5 due to the pressing force of the braking spring 2b. The brake is applied to the high speed shaft 7 to stop it. The core 2 is an electromagnet containing an electromagnetic coil 2a, and when excited, the armature 3 is attracted by a gap g, releasing the pressing force of the braking spring 2b. outer disc 5
A temperature detection device 5a is attached to detect the temperature of heat generated when the relining 4a and the armature 3 rub against each other. A temperature detection device 1a is attached to the reducer 1 and detects the temperature around the magnetic brake. FIG. 2 shows the paths of the signals output from both temperature detection devices, and 8 shows the temperature change of the outer disk 5 that is not related to the temperature around the magnetic brake in the machine room based on the measurement data of the temperature detection device 5a and the temperature detection device 1a. This is a computing device for computing. 9 divides the data received from the arithmetic unit 8 into preset short periods of time before the temperature starts to rise and adversely affects the equipment, and calculates the rate of temperature rise within this time, and the passenger conveyor moves normally. This is a comparison device that compares the temperature with the maximum rate of temperature rise, which is a limit value, and the compared data is transmitted to the passenger conveyor control device. Figure 3 shows the control circuit of the passenger conveyor, R, S, T
is a three-phase AC power supply, 9a is a normally open contact of comparator 9, 10 is a relay for stopping when the magnetic brake temperature is abnormal, 10a
is a normally open contact of relay 10, 10b is a normally closed contact of relay 10, 11 is a relay for upward operation, lla is a normally open contact of relay 11, llb is a normally closed contact of relay 11, 12 is a relay for downward operation, 12a is a normally open contact of relay 12, 12b is a normally closed contact of relay 12, 13 is a switch for upward operation, 1
4 is a switch for descending operation, 15 is a safety device group, and 16 is a motor for driving the passenger conveyor. In normal conditions, when the lift operation switch 13 is pressed, the core 2 is energized,
The disc 4 is opened by the armature 3 being attracted. At the same time, S-10b-15-13-12b
When the relay 11 is excited by the circuit of -11-T, S 10b 15 11a412b 11-
T is self-held, and the motor 16 is supplied with power by entering 11a+, 11a2, and 11a3. [0008] Now, when the armature 3 is not attracted due to a failure of the core 2 or poor adjustment of the gap g, the disc 4 is held between the armature 3 and the outer disc 5 by the pressing force of the brake spring 2b, and is operated in a frictional state. . A temperature detection device 5a attached to the outer disk 5 constantly detects temperature changes in the outer disk, and a temperature detection device 1a detects the temperature around the magnetic brake at the same time. From the temperature data output by this rain detection device, a calculation device 8 calculates the temperature change of the outer disc 5, which removes the influence of the temperature change around the magnetic brake in the machine room.
is calculated. The data after the calculation is transmitted to the comparator 9. This comparison device 9 performs constant sampling and compares the temperature rise rate within the same time using the same sampling method from the maximum temperature rise rate that is the limit value for the passenger conveyor to operate normally and the temperature data after the previous calculation. . The set time and maximum temperature increase rate used for this comparison to calculate the temperature increase rate vary depending on the type and specifications of the passenger conveyor. When the temperature increase rate of the rear outer disk portion exceeds the maximum temperature increase rate by comparing the same temperature increase rate with the comparison device, the normally open contact 9a of the comparison device 9 is closed, and the magnetic brake is stopped when the temperature is abnormal. relay 10 is energized and 1
The relay 10 is self-held by 0a. This results in 1
Since 0b is disconnected, the relay 11 is released, the passenger conveyor stops, and operation cannot be resumed unless the three-phase AC power supply is temporarily shut off to take measures to prevent the cause of the stoppage. In addition, it simultaneously detects only the temperature, which conventional safety devices do, and even if the temperature rises over time rather than suddenly, if a preset abnormal temperature is detected, the above procedure will be followed. The same procedure will cause the passenger conveyor to stop, making it impossible to resume operation. As described above, according to this embodiment, since the motor does not continue to be operated with the disk sandwiched between the armature and the outer disk, there is an effect of preventing a burnout accident of the motor. Furthermore, it is not affected by temperature changes or the environment in the machine room, and has the effect of preventing malfunctions. [0009]

According to the present invention, an abnormality in a magnetic brake can be detected at an early stage, thereby preventing smoking accidents of the magnetic brake and rapid wear of brake shoes.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a disc-shaped magnetic brake portion showing an embodiment of the magnetic brake safety device for a passenger conveyor according to the present invention.

FIG. 2 is a block diagram showing the path of a signal output from a temperature detection device.

FIG. 3 is a control circuit diagram of the passenger conveyor.

[Explanation of symbols]

1 Reducer 2 Core 3 Amateur 4 Disc 4a Lining 5 Outer disc 1a Temperature detection device 5a Temperature detection device 6 Spline hub 7 High speed axis 8 Arithmetic device 9 Comparison device 9a Normally open contact of comparison device 16 Motor

[Figure 1]

Claims (1)

[Claims] 1. A magnetic brake safety device for a passenger conveyor, which is provided on a rotating passenger conveyor in which steps are connected in an endless manner, comprising: a first temperature detection device for detecting the temperature of a brake shoe of a magnetic brake; and a passenger conveyor machine. a second temperature detection device that detects the ambient temperature of the magnetic brake stored indoors; and a calculation that calculates the temperature of the brake shoe itself by removing the influence of the ambient temperature from the temperature data transmitted from both temperature detection devices. a comparison device that receives data after calculation processing from the calculation device and compares the temperature increase rate within a preset reference time with the maximum temperature increase rate at which the passenger conveyor can operate normally; and the comparison device A magnet for a passenger conveyor, comprising: a control means for determining whether or not the passenger conveyor is operating normally based on data from the above, and outputting a command to stop the passenger conveyor if it is determined to be abnormal. Brake safety device.